Instruments and Effects

108 Chapter 6 Filter
∏ Tip: For good pitch tracking, it is essential to use a mono signal (with no overlap of
pitches) that is as unprocessed as possible. Avoid using a signal with background
noises. Using a signal processed with even a slight amount of reverb, for example, will
produce strange (and likely undesirable) results. Even stranger results will result when a
signal with no audible pitch (such as drum loop) is used. In some situations, however,
the resulting artifacts might be desirable.
The EVOC 20 TrackOscillator is not limited to pitch tracking effects. It can vocode a
signal by itself, making it very useful for unusual filter effects. Try this with different
Resonance, Formant Shift, and Formant Stretch settings. As both analysis and synthesis
input signals are freely selectable, you can even vocode an orchestra with train noises,
for example.
More information about vocoders can be found in “Vocoder Basics” on page 206.
EVOC 20 TrackOscillator Parameters
The EVOC 20 TrackOscillator window is divided into the following sections, from left to
right: Analysis In, Synthesis In, Tracking Oscillator, Formant Filter, LFO, U/V Detection
and Output.
Analysis In Section
The parameters in section control various aspects of the analysis signal.
 Attack knob: Controls how quickly the envelope follower coupled to each analysis
filter band reacts to rising signals. Longer Attack times result in a slower tracking
response to transients of the analysis input signal.